An exponential moving average (ema), also known as an exponentially weighted moving average (ewma)
is a first-order infinite impulse response filter that applies weighting factors which decrease
exponentially. The weighting for each older datum decreases exponentially, never reaching zero.

In simple terms, this is like an average value, but more recent values are given more weight.

Netdata automatically adjusts the weight (alpha) based on the number of values processed,
using the formula: